The dopamine D3 receptor (DRD3) is a G protein-coupled receptor that belongs to the dopamine D2-like receptor family. It is preferentially expressed in limbic regions that are associated with cognitive and emotional functions. Previous neurochemical and anatomical investigations have suggested a role for DRD3 in the pathology of schizophrenia. Also, pharmacological studies have shown that many antipsychotic drugs exhibit a high affinity for DRD3. These lines of evidence implicate a role of this rece...